Sincerely,
countrypunpkin :?:
Do not replace sensors one at a time. Scan for trouble codes first, then test the EGR valve, mass airflow sensor, oxygen sensor, and idle air control valve. Also check for a fuel problem such as clogged injectors or a faulty fuel pressure regulator using a volt/ohmmeter, hand vacuum pump, and fuel pressure gauge, and get a second opinion from another shop.
A 1996 Ford Taurus with over 206,000 miles sometimes uses excessive fuel, idles high, shifts hard, nearly stalls or dies at lights, and sometimes does not respond to the accelerator. A shop suggested replacing six sensors one at a time. Experts advised leaving that shop, scanning for codes, and testing the EGR, mass airflow, oxygen, and idle air control components, plus checking fuel delivery, before replacing parts.